Electromagnetically operated switching device

Abstract

A switching contact, an electromagnetically operated electromagnet for driving the switching contact, and a drive power source device for driving the electromagnetically operated electromagnet. The electromagnetically operated electromagnet includes a movable core coupled to a movable contact of the switching contact, a fixed core located in a peripheral portion of the movable core, and coils wound around the movable core and the fixed core. Currents are supplied to the coils to drive the movable core. Capacitors store charges for supplying the current to the coils. Resistors are arranged in series with a path through which the capacitors are connected with the coils of the electromagnetically operated electromagnet and through which a current for closing operation flows. Capacitances of the capacitors and values of the resistors are controlled to adjust a supplied current characteristic to the electromagnetically operated electromagnet.

1. An electromagnetically operated switching device, comprising:
 a switch including a fixed contact and a movable contact opposed to the fixed contact; 
 an electromagnetically operated unit including:
 a movable core coupled to the movable contact; 
 a fixed core fixedly provided in a peripheral portion of the movable core; and 
 a coil provided on the fixed core, for driving the movable core, 
 wherein the electromagnetically operated unit switches the switch by driving 
 
 the movable core; 
 a contact pressure spring for holding a contact pressure between the movable contact and the fixed contact; 
 a capacitor storing a charge for supplying a discharging current to the coil by discharging; 
 a charging device for charging the capacitor; and 
 a resistor which is located outside the charging device and connected in series with conductive wires through which the discharging current flows from the capacitor to the coil for switching the switch, the resistor having a resistance value that reduces a peak value of the discharging current and adjusts a waveform of the discharging current to hold a coil current value required to generate a switching drive force opposed to a force of the contact pressure spring at a time when the contact pressure spring operates. 
 
     
     
       2. The electromagnetically operated switching device according to  claim 1 , further comprising:
 a control switch in series with the capacitor and the resistor, the control switch configured to control the flow of discharging current from the capacitor through the resistor to the coil. 
 
     
     
       3. The electromagnetically operated switching device according to  claim 1 , wherein the coil is configured to move the movable core in a first direction when the discharging current flows from the capacitor to the coil, and
 the electromagnetically operated switching device further comprises: 
 a second coil; 
 a second capacitor; and 
 a second resistor which is located outside the charging device and connected in series with second conductive wires through which a second discharging current flows from the second capacitor to the second coil for moving the movable core in a second direction, the second direction being opposite the first direction. 
 
     
     
       4. A vacuum valve including the electromagnetically operated switching device according to  claim 1 .